Tweet
Calling the Moon 'Luna'. 
-
-
There are many moons. Luna seems like a great name for the moon of our planet.
I thought anything large enough to be spherical under its own gravity and circling a star in its own orbital plane was a planet. This definition excludes comets, asteroids, moons, and Kuiper belt objects.
Again, I don't think it's a fair definition. what about planets that are left behind disappearing stars? are they not planets anymore?Comment
-
Of course not, they are no longer orbiting a star. I'm not sure what they are called in that instance (a rogue planetoid comes to mind).Originally posted by Az
Again, I don't think it's a fair definition. what about planets that are left behind disappearing stars? are they not planets anymore?
I'd be more concerned about why those stars are disappearing.
"And so, my fellow Americans: ask not what your country can do for you—ask what you can do for your country. My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man." -- JFK Inaugural, 1961
"Extremism in the defense of liberty is not a vice." -- Barry Goldwater, 1964 GOP Nomination acceptance speech (not George W. Bush 40 years later...)
2004 Presidential Candidate
2008 Presidential Candidate (for what its worth)Comment
-
Of course not, they are no longer orbiting a star.
Well, I disagree.
I'd be more concerned about why those stars are disappearing.
Not necessarily disappearing completely but possibly losing enough mass so that the planets aren't orbiting them ( after the creation of a nebula, for example )Comment
-
That's okay. The definition is vague enough to make us both right (or wrong).Originally posted by Az
Of course not, they are no longer orbiting a star.
Well, I disagree.
"And so, my fellow Americans: ask not what your country can do for you—ask what you can do for your country. My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man." -- JFK Inaugural, 1961
"Extremism in the defense of liberty is not a vice." -- Barry Goldwater, 1964 GOP Nomination acceptance speech (not George W. Bush 40 years later...)
2004 Presidential Candidate
2008 Presidential Candidate (for what its worth)Comment
-
You could probably get a situation where a red dwarf (star) is orbiting a pair of brown dwarfs (planets... kinda).Comment
-
Agreed. Very pretentiousOriginally posted by Sandman
Calling the Moon 'Luna'.
Comment
-
Brown dwarfs stretch the definition even further. Extra large planets can be considered failed stars so your example could also represent a trinary system.Originally posted by Sandman
You could probably get a situation where a red dwarf (star) is orbiting a pair of brown dwarfs (planets... kinda).
"And so, my fellow Americans: ask not what your country can do for you—ask what you can do for your country. My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man." -- JFK Inaugural, 1961
"Extremism in the defense of liberty is not a vice." -- Barry Goldwater, 1964 GOP Nomination acceptance speech (not George W. Bush 40 years later...)
2004 Presidential Candidate
2008 Presidential Candidate (for what its worth)Comment
-
IIRC, that wouldn't include the center of mass in either between the planets, or in the star, making it a tertiary system.Comment
-
Originally posted by Vince278
Brown dwarfs stretch the definition even further.
Hmmm....
Brown dwarf in the ring
Tra la la la la
There's a brown dwarf in the ring
Tra la la la la la
Brown dwarfl in the ring
Tra la la la la
She looks like a sugar in a plum
Plum plum
Show me your motion
Tra la la la la
Come on show me your planetary motion
Tra la la la la la
Show me your planetary motion
Tra la la la la
She looks like a sugar in a plum
Plum plumAttached FilesVive la liberte. Noor Inayat Khan, Dachau.
...patriotism is not enough. I must have no hatred or bitterness towards anyone. Edith Cavell, 1915Comment
-
-
Brown dwarfs stretch the definition even further. Extra large planets can be considered failed stars so your example could also represent a trinary system.
ARGGHHHH. longest X-post ever.Comment
-
Aroseplanet by any other name....One day Canada will rule the world, and then we'll all be sorry.Comment
-
Calling objects pluto size or larger planets is fine by me. Calling anything smaller a planetoid is fine also.
In order for us to call something a planet. Criteria should be,
It has to revolve around the sun
It has to have a diameter of 1000km or more
There. I think I settled it. Lets start burning our space history books now and make new onesComment
-
1. Why 1000km?Originally posted by faded glory
It has to revolve around the sun
It has to have a diameter of 1000km or more
2. We've discovered lots of extrasolar planets and none of them revolve around the sun.
"And so, my fellow Americans: ask not what your country can do for you—ask what you can do for your country. My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man." -- JFK Inaugural, 1961
"Extremism in the defense of liberty is not a vice." -- Barry Goldwater, 1964 GOP Nomination acceptance speech (not George W. Bush 40 years later...)
2004 Presidential Candidate
2008 Presidential Candidate (for what its worth)Comment
-
can we name this one planet X?Comment
Comment